139990919 has 2 divisors, whose sum is σ = 139990920. Its totient is φ = 139990918.

The previous prime is 139990909. The next prime is 139990927. The reversal of 139990919 is 919099931.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 139990919 - 2⁸ = 139990663 is a prime.

It is a super-2 number, since 2×139990919² = 39194914804929122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139990909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69995459 + 69995460.

It is an arithmetic number, because the mean of its divisors is an integer number (69995460).

Almost surely, 2^139990919 is an apocalyptic number.

139990919 is a deficient number, since it is larger than the sum of its proper divisors (1).

139990919 is an equidigital number, since it uses as much as digits as its factorization.

139990919 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 177147, while the sum is 50.

The square root of 139990919 is about 11831.7758176869. The cubic root of 139990919 is about 519.2381830283.

The spelling of 139990919 in words is "one hundred thirty-nine million, nine hundred ninety thousand, nine hundred nineteen".