161208240 has 40 divisors (see below), whose sum is σ = 499746288. Its totient is φ = 42988800.

The previous prime is 161208209. The next prime is 161208241. The reversal of 161208240 is 42802161.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 161208240.

It is not an unprimeable number, because it can be changed into a prime (161208241) 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, 335611 + ... + 336090.

Almost surely, 2^161208240 is an apocalyptic number.

161208240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161208240 is an abundant number, since it is smaller than the sum of its proper divisors (338538048).

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

161208240 is a wasteful number, since it uses less digits than its factorization.

161208240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 671717 (or 671711 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 24.

The square root of 161208240 is about 12696.7806943335. The cubic root of 161208240 is about 544.2466262068.

The spelling of 161208240 in words is "one hundred sixty-one million, two hundred eight thousand, two hundred forty".