1372991 has 2 divisors, whose sum is σ = 1372992. Its totient is φ = 1372990.

The previous prime is 1372981. The next prime is 1372999. The reversal of 1372991 is 1992731.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1372991 is a prime.

It is a Chen prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1372999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 686495 + 686496.

It is an arithmetic number, because the mean of its divisors is an integer number (686496).

2^1372991 is an apocalyptic number.

1372991 is a deficient number, since it is larger than the sum of its proper divisors (1).

1372991 is an equidigital number, since it uses as much as digits as its factorization.

1372991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3402, while the sum is 32.

The square root of 1372991 is about 1171.7469863413. The cubic root of 1372991 is about 111.1448208459.

The spelling of 1372991 in words is "one million, three hundred seventy-two thousand, nine hundred ninety-one".