155689940 has 48 divisors (see below), whose sum is σ = 374707200. Its totient is φ = 53229312.

The previous prime is 155689907. The next prime is 155689943. The reversal of 155689940 is 49986551.

155689940 = T₁₆₁ + T₁₆₂ + ... + T₉₇₈.

It is a happy number.

155689940 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155689943) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55901 + ... + 58619.

It is an arithmetic number, because the mean of its divisors is an integer number (7806400).

Almost surely, 2^155689940 is an apocalyptic number.

155689940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

155689940 is an abundant number, since it is smaller than the sum of its proper divisors (219017260).

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

155689940 is a wasteful number, since it uses less digits than its factorization.

155689940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3144 (or 3142 counting only the distinct ones).

The product of its (nonzero) digits is 388800, while the sum is 47.

The square root of 155689940 is about 12477.5774892404. The cubic root of 155689940 is about 537.9643753215.

The spelling of 155689940 in words is "one hundred fifty-five million, six hundred eighty-nine thousand, nine hundred forty".