155109690 has 96 divisors (see below), whose sum is σ = 423895680. Its totient is φ = 39295872.

The previous prime is 155109679. The next prime is 155109697. The reversal of 155109690 is 96901551.

It is a super-2 number, since 2×155109690² = 48118031863792200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (155109697) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 174427 + ... + 175313.

It is an arithmetic number, because the mean of its divisors is an integer number (4415580).

Almost surely, 2^155109690 is an apocalyptic number.

155109690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 155109690, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (211947840).

155109690 is an abundant number, since it is smaller than the sum of its proper divisors (268785990).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

155109690 is a wasteful number, since it uses less digits than its factorization.

155109690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 996 (or 993 counting only the distinct ones).

The product of its (nonzero) digits is 12150, while the sum is 36.

The square root of 155109690 is about 12454.3040752986. The cubic root of 155109690 is about 537.2952196297.

It can be divided in two parts, 15510 and 9690, that added together give a triangular number (25200 = T₂₂₄).

The spelling of 155109690 in words is "one hundred fifty-five million, one hundred nine thousand, six hundred ninety".