155293438 has 4 divisors (see below), whose sum is σ = 232940160. Its totient is φ = 77646718.

The previous prime is 155293433. The next prime is 155293451. The reversal of 155293438 is 834392551.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 155293438.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155293433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38823358 + ... + 38823361.

It is an arithmetic number, because the mean of its divisors is an integer number (58235040).

Almost surely, 2^155293438 is an apocalyptic number.

155293438 is a deficient number, since it is larger than the sum of its proper divisors (77646722).

155293438 is an equidigital number, since it uses as much as digits as its factorization.

155293438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77646721.

The product of its digits is 129600, while the sum is 40.

The square root of 155293438 is about 12461.6787793620. The cubic root of 155293438 is about 537.5073017216.

The spelling of 155293438 in words is "one hundred fifty-five million, two hundred ninety-three thousand, four hundred thirty-eight".