1399155285 has 32 divisors (see below), whose sum is σ = 2498969088. Its totient is φ = 662598720.

The previous prime is 1399155281. The next prime is 1399155287. The reversal of 1399155285 is 5825519931.

It is not a de Polignac number, because 1399155285 - 2² = 1399155281 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1399155281) 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, 91507 + ... + 105696.

It is an arithmetic number, because the mean of its divisors is an integer number (78092784).

Almost surely, 2^1399155285 is an apocalyptic number.

1399155285 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1399155285 is a deficient number, since it is larger than the sum of its proper divisors (1099813803).

1399155285 is a wasteful number, since it uses less digits than its factorization.

1399155285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197265.

The product of its digits is 486000, while the sum is 48.

The square root of 1399155285 is about 37405.2841855265. The cubic root of 1399155285 is about 1118.4639031650.

The spelling of 1399155285 in words is "one billion, three hundred ninety-nine million, one hundred fifty-five thousand, two hundred eighty-five".