155394690 has 128 divisors (see below), whose sum is σ = 426995712. Its totient is φ = 35857920.

The previous prime is 155394683. The next prime is 155394691. The reversal of 155394690 is 96493551.

It is a super-2 number, since 2×155394690² = 48295019360392200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (155394691) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 666814 + ... + 667046.

It is an arithmetic number, because the mean of its divisors is an integer number (3335904).

Almost surely, 2^155394690 is an apocalyptic number.

155394690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 155394690, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (213497856).

155394690 is an abundant number, since it is smaller than the sum of its proper divisors (271601022).

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

155394690 is a wasteful number, since it uses less digits than its factorization.

155394690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 344.

The product of its (nonzero) digits is 145800, while the sum is 42.

The square root of 155394690 is about 12465.7406518827. The cubic root of 155394690 is about 537.6240953783.

The spelling of 155394690 in words is "one hundred fifty-five million, three hundred ninety-four thousand, six hundred ninety".