139406290 has 16 divisors (see below), whose sum is σ = 265692312. Its totient is φ = 52482304.

The previous prime is 139406279. The next prime is 139406303. The reversal of 139406290 is 92604931.

139406290 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 105452361 + 33953929 = 10269^2 + 5827^2 .

It is a super-2 number, since 2×139406290² = 38868227383128200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (34).

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, 409849 + ... + 410188.

Almost surely, 2^139406290 is an apocalyptic number.

139406290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

139406290 is a deficient number, since it is larger than the sum of its proper divisors (126286022).

139406290 is a wasteful number, since it uses less digits than its factorization.

139406290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 820061.

The product of its (nonzero) digits is 11664, while the sum is 34.

The square root of 139406290 is about 11807.0440839357. The cubic root of 139406290 is about 518.5143616491.

The spelling of 139406290 in words is "one hundred thirty-nine million, four hundred six thousand, two hundred ninety".