155195640 has 48 divisors (see below), whose sum is σ = 504387000. Its totient is φ = 41385408.

The previous prime is 155195609. The next prime is 155195657. The reversal of 155195640 is 46591551.

155195640 is a `hidden beast` number, since 1 + 5 + 5 + 1 + 9 + 5 + 640 = 666.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 155195595 and 155195604.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 215190 + ... + 215909.

Almost surely, 2^155195640 is an apocalyptic number.

155195640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

155195640 is an abundant number, since it is smaller than the sum of its proper divisors (349191360).

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

155195640 is a wasteful number, since it uses less digits than its factorization.

155195640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 431116 (or 431109 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 36.

The square root of 155195640 is about 12457.7542117350. The cubic root of 155195640 is about 537.3944440277.

The spelling of 155195640 in words is "one hundred fifty-five million, one hundred ninety-five thousand, six hundred forty".