1392664 has 32 divisors (see below), whose sum is σ = 3215520. Its totient is φ = 550656.

The previous prime is 1392649. The next prime is 1392679. The reversal of 1392664 is 4662931.

1392664 = T₂₁ + T₂₂ + ... + T₂₀₂.

It is an interprime number because it is at equal distance from previous prime (1392649) and next prime (1392679).

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 229 + ... + 1684.

It is an arithmetic number, because the mean of its divisors is an integer number (100485).

2^1392664 is an apocalyptic number.

1392664 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1392664 is an abundant number, since it is smaller than the sum of its proper divisors (1822856).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1392664 is a wasteful number, since it uses less digits than its factorization.

1392664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1939 (or 1935 counting only the distinct ones).

The product of its digits is 7776, while the sum is 31.

The square root of 1392664 is about 1180.1118591049. Note that the first 3 decimals coincide. The cubic root of 1392664 is about 111.6731542480.

The spelling of 1392664 in words is "one million, three hundred ninety-two thousand, six hundred sixty-four".