155242840 has 16 divisors (see below), whose sum is σ = 349296480. Its totient is φ = 62097120.

The previous prime is 155242837. The next prime is 155242873. The reversal of 155242840 is 48242551.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1940496 + ... + 1940575.

It is an arithmetic number, because the mean of its divisors is an integer number (21831030).

Almost surely, 2^155242840 is an apocalyptic number.

155242840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

155242840 is an abundant number, since it is smaller than the sum of its proper divisors (194053640).

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

155242840 is a wasteful number, since it uses less digits than its factorization.

155242840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3881082 (or 3881078 counting only the distinct ones).

The product of its (nonzero) digits is 12800, while the sum is 31.

The square root of 155242840 is about 12459.6484701616. The cubic root of 155242840 is about 537.4489181670.

The spelling of 155242840 in words is "one hundred fifty-five million, two hundred forty-two thousand, eight hundred forty".