1399820401 has 32 divisors (see below), whose sum is σ = 1711987200. Its totient is φ = 1119121920.

The previous prime is 1399820399. The next prime is 1399820413. The reversal of 1399820401 is 1040289931.

It is not a de Polignac number, because 1399820401 - 2¹ = 1399820399 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1399820431) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 906436 + ... + 907978.

It is an arithmetic number, because the mean of its divisors is an integer number (53499600).

Almost surely, 2^1399820401 is an apocalyptic number.

It is an amenable number.

1399820401 is a deficient number, since it is larger than the sum of its proper divisors (312166799).

1399820401 is a wasteful number, since it uses less digits than its factorization.

1399820401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1729.

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 1399820401 is about 37414.1737981744. The cubic root of 1399820401 is about 1118.6411030320.

The spelling of 1399820401 in words is "one billion, three hundred ninety-nine million, eight hundred twenty thousand, four hundred one".