139402837 has 4 divisors (see below), whose sum is σ = 159317536. Its totient is φ = 119488140.

The previous prime is 139402831. The next prime is 139402841. The reversal of 139402837 is 738204931.

139402837 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 139402837 - 2⁷ = 139402709 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 139402796 and 139402805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139402831) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9957339 + ... + 9957352.

It is an arithmetic number, because the mean of its divisors is an integer number (39829384).

Almost surely, 2^139402837 is an apocalyptic number.

It is an amenable number.

139402837 is a deficient number, since it is larger than the sum of its proper divisors (19914699).

139402837 is an equidigital number, since it uses as much as digits as its factorization.

139402837 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19914698.

The product of its (nonzero) digits is 36288, while the sum is 37.

The square root of 139402837 is about 11806.8978567615. The cubic root of 139402837 is about 518.5100805298.

The spelling of 139402837 in words is "one hundred thirty-nine million, four hundred two thousand, eight hundred thirty-seven".