990691402 has 8 divisors (see below), whose sum is σ = 1486717056. Its totient is φ = 495119052.

The previous prime is 990691393. The next prime is 990691411. The reversal of 990691402 is 204196099.

It is an interprime number because it is at equal distance from previous prime (990691393) and next prime (990691411).

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, 107808 + ... + 116635.

It is an arithmetic number, because the mean of its divisors is an integer number (185839632).

Almost surely, 2^990691402 is an apocalyptic number.

990691402 is a deficient number, since it is larger than the sum of its proper divisors (496025654).

990691402 is a wasteful number, since it uses less digits than its factorization.

990691402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226652.

The product of its (nonzero) digits is 34992, while the sum is 40.

The square root of 990691402 is about 31475.2506264843. The cubic root of 990691402 is about 996.8874561220.

It can be divided in two parts, 9 and 90691402, that multiplied together give a palindrome (816222618).

The spelling of 990691402 in words is "nine hundred ninety million, six hundred ninety-one thousand, four hundred two".