139634943 has 32 divisors (see below), whose sum is σ = 220987392. Its totient is φ = 76744800.

The previous prime is 139634897. The next prime is 139634951. The reversal of 139634943 is 349436931.

It is not a de Polignac number, because 139634943 - 2¹⁶ = 139569407 is a prime.

It is a super-2 number, since 2×139634943² = 38995834613226498, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 139634895 and 139634904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139634983) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 123780 + ... + 124902.

It is an arithmetic number, because the mean of its divisors is an integer number (6905856).

Almost surely, 2^139634943 is an apocalyptic number.

139634943 is a deficient number, since it is larger than the sum of its proper divisors (81352449).

139634943 is a wasteful number, since it uses less digits than its factorization.

139634943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1355.

The product of its digits is 209952, while the sum is 42.

The square root of 139634943 is about 11816.7230229028. The cubic root of 139634943 is about 518.7976944003.

The spelling of 139634943 in words is "one hundred thirty-nine million, six hundred thirty-four thousand, nine hundred forty-three".