1399664541 has 8 divisors (see below), whose sum is σ = 2035875744. Its totient is φ = 848281520.

The previous prime is 1399664503. The next prime is 1399664549. The reversal of 1399664541 is 1454669931.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1399664541 - 2²³ = 1391275933 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1399664549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21207006 + ... + 21207071.

It is an arithmetic number, because the mean of its divisors is an integer number (254484468).

Almost surely, 2^1399664541 is an apocalyptic number.

1399664541 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1399664541 is a deficient number, since it is larger than the sum of its proper divisors (636211203).

1399664541 is a wasteful number, since it uses less digits than its factorization.

1399664541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42414091.

The product of its digits is 699840, while the sum is 48.

The square root of 1399664541 is about 37412.0908397272. The cubic root of 1399664541 is about 1118.5995839263.

The spelling of 1399664541 in words is "one billion, three hundred ninety-nine million, six hundred sixty-four thousand, five hundred forty-one".