139991477 has 4 divisors (see below), whose sum is σ = 140162400. Its totient is φ = 139820556.

The previous prime is 139991471. The next prime is 139991513. The reversal of 139991477 is 774199931.

It is a happy number.

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 139991477 - 2¹² = 139987381 is a prime.

It is a super-2 number, since 2×139991477² = 39195227265283058, 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 (139991471) 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, 84227 + ... + 85872.

It is an arithmetic number, because the mean of its divisors is an integer number (35040600).

Almost surely, 2^139991477 is an apocalyptic number.

It is an amenable number.

139991477 is a deficient number, since it is larger than the sum of its proper divisors (170923).

139991477 is an equidigital number, since it uses as much as digits as its factorization.

139991477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170922.

The product of its digits is 428652, while the sum is 50.

The square root of 139991477 is about 11831.7993982319. The cubic root of 139991477 is about 519.2388729172.

The spelling of 139991477 in words is "one hundred thirty-nine million, nine hundred ninety-one thousand, four hundred seventy-seven".