1399672561 has 8 divisors (see below), whose sum is σ = 1601744960. Its totient is φ = 1198129968.

The previous prime is 1399672541. The next prime is 1399672619. The reversal of 1399672561 is 1652769931.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1399672561 - 2⁹ = 1399672049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1399672541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 126771 + ... + 137368.

It is an arithmetic number, because the mean of its divisors is an integer number (200218120).

Almost surely, 2^1399672561 is an apocalyptic number.

It is an amenable number.

1399672561 is a deficient number, since it is larger than the sum of its proper divisors (202072399).

1399672561 is an equidigital number, since it uses as much as digits as its factorization.

1399672561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 264903.

The product of its digits is 612360, while the sum is 49.

The square root of 1399672561 is about 37412.1980241739. The cubic root of 1399672561 is about 1118.6017204267.

The spelling of 1399672561 in words is "one billion, three hundred ninety-nine million, six hundred seventy-two thousand, five hundred sixty-one".