155120402 has 4 divisors (see below), whose sum is σ = 232680606. Its totient is φ = 77560200.

The previous prime is 155120387. The next prime is 155120419. The reversal of 155120402 is 204021551.

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

It can be written as a sum of positive squares in only one way, i.e., 98585041 + 56535361 = 9929^2 + 7519^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38780099 + ... + 38780102.

Almost surely, 2^155120402 is an apocalyptic number.

155120402 is a deficient number, since it is larger than the sum of its proper divisors (77560204).

155120402 is an equidigital number, since it uses as much as digits as its factorization.

155120402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77560203.

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 155120402 is about 12454.7341200043. The cubic root of 155120402 is about 537.3075880250.

Adding to 155120402 its reverse (204021551), we get a palindrome (359141953).

The spelling of 155120402 in words is "one hundred fifty-five million, one hundred twenty thousand, four hundred two".