139504390 has 16 divisors (see below), whose sum is σ = 251410032. Its totient is φ = 55734624.

The previous prime is 139504381. The next prime is 139504399. The reversal of 139504390 is 93405931.

It is an interprime number because it is at equal distance from previous prime (139504381) and next prime (139504399).

It is a super-2 number, since 2×139504390² = 38922949658544200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139504399) 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, 817 + ... + 16723.

It is an arithmetic number, because the mean of its divisors is an integer number (15713127).

Almost surely, 2^139504390 is an apocalyptic number.

139504390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

139504390 is a deficient number, since it is larger than the sum of its proper divisors (111905642).

139504390 is a wasteful number, since it uses less digits than its factorization.

139504390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16791.

The product of its (nonzero) digits is 14580, while the sum is 34.

The square root of 139504390 is about 11811.1976530748. The cubic root of 139504390 is about 518.6359590606.

The spelling of 139504390 in words is "one hundred thirty-nine million, five hundred four thousand, three hundred ninety".