139504399 has 2 divisors, whose sum is σ = 139504400. Its totient is φ = 139504398.

The previous prime is 139504381. The next prime is 139504423. The reversal of 139504399 is 993405931.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 139504399 - 2¹³ = 139496207 is a prime.

It is a super-2 number, since 2×139504399² = 38922954680702402, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139504999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69752199 + 69752200.

It is an arithmetic number, because the mean of its divisors is an integer number (69752200).

Almost surely, 2^139504399 is an apocalyptic number.

139504399 is a deficient number, since it is larger than the sum of its proper divisors (1).

139504399 is an equidigital number, since it uses as much as digits as its factorization.

139504399 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 131220, while the sum is 43.

The square root of 139504399 is about 11811.1980340692. The cubic root of 139504399 is about 518.6359702137.

The spelling of 139504399 in words is "one hundred thirty-nine million, five hundred four thousand, three hundred ninety-nine".