1392290 has 16 divisors (see below), whose sum is σ = 2593080. Its totient is φ = 537600.

The previous prime is 1392277. The next prime is 1392311. The reversal of 1392290 is 922931.

It can be written as a sum of positive squares in 4 ways, for example, as 1168561 + 223729 = 1081^2 + 473^2 .

It is an Ulam number.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2111 + ... + 2690.

2^1392290 is an apocalyptic number.

1392290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1392290 is a deficient number, since it is larger than the sum of its proper divisors (1200790).

1392290 is a wasteful number, since it uses less digits than its factorization.

1392290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4837.

The product of its (nonzero) digits is 972, while the sum is 26.

The square root of 1392290 is about 1179.9533889099. The cubic root of 1392290 is about 111.6631567422.

The spelling of 1392290 in words is "one million, three hundred ninety-two thousand, two hundred ninety".