139400069 has 4 divisors (see below), whose sum is σ = 139592544. Its totient is φ = 139207596.

The previous prime is 139400047. The next prime is 139400083. The reversal of 139400069 is 960004931.

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 a de Polignac number, because none of the positive numbers 2^k-139400069 is a prime.

It is a super-2 number, since 2×139400069² = 38864758474409522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139400039) 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, 95147 + ... + 96600.

It is an arithmetic number, because the mean of its divisors is an integer number (34898136).

Almost surely, 2^139400069 is an apocalyptic number.

It is an amenable number.

139400069 is a deficient number, since it is larger than the sum of its proper divisors (192475).

139400069 is an equidigital number, since it uses as much as digits as its factorization.

139400069 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192474.

The product of its (nonzero) digits is 5832, while the sum is 32.

The square root of 139400069 is about 11806.7806365664. The cubic root of 139400069 is about 518.5066486403.

The spelling of 139400069 in words is "one hundred thirty-nine million, four hundred thousand, sixty-nine".