2155490 has 16 divisors (see below), whose sum is σ = 3896640. Its totient is φ = 858480.

The previous prime is 2155487. The next prime is 2155499. The reversal of 2155490 is 945512.

It is a super-2 number, since 2×2155490² = 9292274280200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2155499) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4145 + ... + 4635.

It is an arithmetic number, because the mean of its divisors is an integer number (243540).

2^2155490 is an apocalyptic number.

2155490 is a deficient number, since it is larger than the sum of its proper divisors (1741150).

2155490 is a wasteful number, since it uses less digits than its factorization.

2155490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 937.

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 2155490 is about 1468.1587107667. The cubic root of 2155490 is about 129.1760511161.

The spelling of 2155490 in words is "two million, one hundred fifty-five thousand, four hundred ninety".