990215401 has 4 divisors (see below), whose sum is σ = 1131674752. Its totient is φ = 848756052.

The previous prime is 990215393. The next prime is 990215431. The reversal of 990215401 is 104512099.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 104512099 = 593 ⋅176243.

It is a cyclic number.

It is not a de Polignac number, because 990215401 - 2³ = 990215393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (990215431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70729665 + ... + 70729678.

It is an arithmetic number, because the mean of its divisors is an integer number (282918688).

Almost surely, 2^990215401 is an apocalyptic number.

It is an amenable number.

990215401 is a deficient number, since it is larger than the sum of its proper divisors (141459351).

990215401 is a wasteful number, since it uses less digits than its factorization.

990215401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141459350.

The product of its (nonzero) digits is 3240, while the sum is 31.

The square root of 990215401 is about 31467.6882055228. The cubic root of 990215401 is about 996.7277711978.

The spelling of 990215401 in words is "nine hundred ninety million, two hundred fifteen thousand, four hundred one".