155213240 has 64 divisors (see below), whose sum is σ = 429831360. Its totient is φ = 49121280.

The previous prime is 155213221. The next prime is 155213321. The reversal of 155213240 is 42312551.

It is a super-2 number, since 2×155213240² = 48182299742595200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17681 + ... + 24960.

It is an arithmetic number, because the mean of its divisors is an integer number (6716115).

Almost surely, 2^155213240 is an apocalyptic number.

155213240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

155213240 is an abundant number, since it is smaller than the sum of its proper divisors (274618120).

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

155213240 is a wasteful number, since it uses less digits than its factorization.

155213240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42672 (or 42668 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 155213240 is about 12458.4605790603. The cubic root of 155213240 is about 537.4147577098.

Adding to 155213240 its reverse (42312551), we get a palindrome (197525791).

The spelling of 155213240 in words is "one hundred fifty-five million, two hundred thirteen thousand, two hundred forty".