155279380 has 24 divisors (see below), whose sum is σ = 334901448. Its totient is φ = 60432768.

The previous prime is 155279359. The next prime is 155279413. The reversal of 155279380 is 83972551.

It can be written as a sum of positive squares in 4 ways, for example, as 81216144 + 74063236 = 9012^2 + 8606^2 .

It is a super-2 number, since 2×155279380² = 48223371706368800, 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 7 ways as a sum of consecutive naturals, for example, 104179 + ... + 105658.

It is an arithmetic number, because the mean of its divisors is an integer number (13954227).

Almost surely, 2^155279380 is an apocalyptic number.

155279380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

155279380 is an abundant number, since it is smaller than the sum of its proper divisors (179622068).

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

155279380 is a wasteful number, since it uses less digits than its factorization.

155279380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209883 (or 209881 counting only the distinct ones).

The product of its (nonzero) digits is 75600, while the sum is 40.

The square root of 155279380 is about 12461.1147173919. The cubic root of 155279380 is about 537.4910818784.

The spelling of 155279380 in words is "one hundred fifty-five million, two hundred seventy-nine thousand, three hundred eighty".