155797390 has 32 divisors (see below), whose sum is σ = 320993280. Its totient is φ = 53333664.

The previous prime is 155797387. The next prime is 155797463. The reversal of 155797390 is 93797551.

It is a happy number.

Together with 165195890 it forms an amicable pair .

It is a self number, because there is not a number n which added to its sum of digits gives 155797390.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 59121 + ... + 61699.

It is an arithmetic number, because the mean of its divisors is an integer number (10031040).

Almost surely, 2^155797390 is an apocalyptic number.

155797390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

155797390 is an abundant number, since it is smaller than the sum of its proper divisors (165195890).

155797390 is a wasteful number, since it uses less digits than its factorization.

155797390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3456.

The product of its (nonzero) digits is 297675, while the sum is 46.

The square root of 155797390 is about 12481.8824702046. The cubic root of 155797390 is about 538.0881062431.

The spelling of 155797390 in words is "one hundred fifty-five million, seven hundred ninety-seven thousand, three hundred ninety".