139684390 has 16 divisors (see below), whose sum is σ = 264665520. Its totient is φ = 52932960.

The previous prime is 139684381. The next prime is 139684399. The reversal of 139684390 is 93486931.

It is an interprime number because it is at equal distance from previous prime (139684381) and next prime (139684399).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139684399) 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, 367401 + ... + 367780.

It is an arithmetic number, because the mean of its divisors is an integer number (16541595).

Almost surely, 2^139684390 is an apocalyptic number.

139684390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

139684390 is a deficient number, since it is larger than the sum of its proper divisors (124981130).

139684390 is a wasteful number, since it uses less digits than its factorization.

139684390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 735207.

The product of its (nonzero) digits is 139968, while the sum is 43.

The square root of 139684390 is about 11818.8150844321. The cubic root of 139684390 is about 518.8589254016.

The spelling of 139684390 in words is "one hundred thirty-nine million, six hundred eighty-four thousand, three hundred ninety".