231401428 has 12 divisors (see below), whose sum is σ = 410079040. Its totient is φ = 114235992.

The previous prime is 231401407. The next prime is 231401431. The reversal of 231401428 is 824104132.

It is a super-3 number, since 3×231401428³ (a number of 26 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 365826 + ... + 366457.

Almost surely, 2^231401428 is an apocalyptic number.

It is an amenable number.

231401428 is a deficient number, since it is larger than the sum of its proper divisors (178677612).

231401428 is a wasteful number, since it uses less digits than its factorization.

231401428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 732366 (or 732364 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 25.

The square root of 231401428 is about 15211.8844329031. The cubic root of 231401428 is about 613.9344609211.

The spelling of 231401428 in words is "two hundred thirty-one million, four hundred one thousand, four hundred twenty-eight".