1490622391 has 4 divisors (see below), whose sum is σ = 1525288072. Its totient is φ = 1455956712.

The previous prime is 1490622389. The next prime is 1490622451. The reversal of 1490622391 is 1932260941.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1932260941 = 13 ⋅148635457.

It is a cyclic number.

It is not a de Polignac number, because 1490622391 - 2¹ = 1490622389 is a prime.

It is a super-2 number, since 2×1490622391² = 4443910225101113762, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1490622391.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1490622311) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17332776 + ... + 17332861.

It is an arithmetic number, because the mean of its divisors is an integer number (381322018).

Almost surely, 2^1490622391 is an apocalyptic number.

1490622391 is a deficient number, since it is larger than the sum of its proper divisors (34665681).

1490622391 is an equidigital number, since it uses as much as digits as its factorization.

1490622391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34665680.

The product of its (nonzero) digits is 23328, while the sum is 37.

The square root of 1490622391 is about 38608.5792408889. The cubic root of 1490622391 is about 1142.3237690533.

The spelling of 1490622391 in words is "one billion, four hundred ninety million, six hundred twenty-two thousand, three hundred ninety-one".