155405252 has 24 divisors (see below), whose sum is σ = 281493240. Its totient is φ = 75018240.

The previous prime is 155405249. The next prime is 155405309. The reversal of 155405252 is 252504551.

It can be written as a sum of positive squares in 4 ways, for example, as 4096 + 155401156 = 64^2 + 12466^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11024 + ... + 20792.

It is an arithmetic number, because the mean of its divisors is an integer number (11728885).

Almost surely, 2^155405252 is an apocalyptic number.

It is an amenable number.

155405252 is a deficient number, since it is larger than the sum of its proper divisors (126087988).

155405252 is a wasteful number, since it uses less digits than its factorization.

155405252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9911 (or 9909 counting only the distinct ones).

The product of its (nonzero) digits is 10000, while the sum is 29.

The square root of 155405252 is about 12466.1642857777. The cubic root of 155405252 is about 537.6362756680.

The spelling of 155405252 in words is "one hundred fifty-five million, four hundred five thousand, two hundred fifty-two".