155494420 has 12 divisors (see below), whose sum is σ = 326538324. Its totient is φ = 62197760.

The previous prime is 155494403. The next prime is 155494439. The reversal of 155494420 is 24494551.

It can be written as a sum of positive squares in 2 ways, for example, as 118113424 + 37380996 = 10868^2 + 6114^2 .

It is a super-2 number, since 2×155494420² = 48357029302272800, 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 3 ways as a sum of consecutive naturals, for example, 3887341 + ... + 3887380.

It is an arithmetic number, because the mean of its divisors is an integer number (27211527).

Almost surely, 2^155494420 is an apocalyptic number.

155494420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

155494420 is an abundant number, since it is smaller than the sum of its proper divisors (171043904).

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

155494420 is a wasteful number, since it uses less digits than its factorization.

155494420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7774730 (or 7774728 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 34.

The square root of 155494420 is about 12469.7401737165. The cubic root of 155494420 is about 537.7390838309.

The spelling of 155494420 in words is "one hundred fifty-five million, four hundred ninety-four thousand, four hundred twenty".