1390521479 has 4 divisors (see below), whose sum is σ = 1463706840. Its totient is φ = 1317336120.

The previous prime is 1390521467. The next prime is 1390521497. The reversal of 1390521479 is 9741250931.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1390521479 - 2⁴ = 1390521463 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1390529479) 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, 36592652 + ... + 36592689.

It is an arithmetic number, because the mean of its divisors is an integer number (365926710).

Almost surely, 2^1390521479 is an apocalyptic number.

1390521479 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

1390521479 is a deficient number, since it is larger than the sum of its proper divisors (73185361).

1390521479 is an equidigital number, since it uses as much as digits as its factorization.

1390521479 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73185360.

The product of its (nonzero) digits is 68040, while the sum is 41.

The square root of 1390521479 is about 37289.6966868866. The cubic root of 1390521479 is about 1116.1585761375.

The spelling of 1390521479 in words is "one billion, three hundred ninety million, five hundred twenty-one thousand, four hundred seventy-nine".