1397290 has 8 divisors (see below), whose sum is σ = 2515140. Its totient is φ = 558912.

The previous prime is 1397287. The next prime is 1397303. The reversal of 1397290 is 927931.

It can be written as a sum of positive squares in 2 ways, for example, as 1261129 + 136161 = 1123^2 + 369^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69855 + ... + 69874.

2^1397290 is an apocalyptic number.

1397290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1397290 is a deficient number, since it is larger than the sum of its proper divisors (1117850).

1397290 is a wasteful number, since it uses less digits than its factorization.

1397290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139736.

The product of its (nonzero) digits is 3402, while the sum is 31.

The square root of 1397290 is about 1182.0702178805. The cubic root of 1397290 is about 111.7966655112.

The spelling of 1397290 in words is "one million, three hundred ninety-seven thousand, two hundred ninety".