139954431 has 8 divisors (see below), whose sum is σ = 189768960. Its totient is φ = 91721432.

The previous prime is 139954417. The next prime is 139954447. The reversal of 139954431 is 134459931.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 139954431 - 2¹⁹ = 139430143 is a prime.

It is a super-2 number, since 2×139954431² = 39174485513067522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 139954431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139954411) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 395175 + ... + 395528.

It is an arithmetic number, because the mean of its divisors is an integer number (23721120).

Almost surely, 2^139954431 is an apocalyptic number.

139954431 is a deficient number, since it is larger than the sum of its proper divisors (49814529).

139954431 is an equidigital number, since it uses as much as digits as its factorization.

139954431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 790765.

The product of its digits is 58320, while the sum is 39.

The square root of 139954431 is about 11830.2337677664. The cubic root of 139954431 is about 519.1930667468.

The spelling of 139954431 in words is "one hundred thirty-nine million, nine hundred fifty-four thousand, four hundred thirty-one".