139887469 has 4 divisors (see below), whose sum is σ = 144400000. Its totient is φ = 135374940.

The previous prime is 139887431. The next prime is 139887487. The reversal of 139887469 is 964788931.

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 139887469 - 2²⁵ = 106333037 is a prime.

It is a super-2 number, since 2×139887469² = 39137007966451922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139887499) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2256219 + ... + 2256280.

It is an arithmetic number, because the mean of its divisors is an integer number (36100000).

Almost surely, 2^139887469 is an apocalyptic number.

It is an amenable number.

139887469 is a deficient number, since it is larger than the sum of its proper divisors (4512531).

139887469 is an equidigital number, since it uses as much as digits as its factorization.

139887469 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4512530.

The product of its digits is 2612736, while the sum is 55.

The square root of 139887469 is about 11827.4033075735. The cubic root of 139887469 is about 519.1102499041.

The spelling of 139887469 in words is "one hundred thirty-nine million, eight hundred eighty-seven thousand, four hundred sixty-nine".