990921542 has 16 divisors (see below), whose sum is σ = 1617225792. Its totient is φ = 452632320.

The previous prime is 990921469. The next prime is 990921557. The reversal of 990921542 is 245129099.

It is a happy number.

It is a super-3 number, since 3×990921542³ (a number of 28 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 990921542.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 193934 + ... + 198977.

It is an arithmetic number, because the mean of its divisors is an integer number (101076612).

Almost surely, 2^990921542 is an apocalyptic number.

990921542 is a deficient number, since it is larger than the sum of its proper divisors (626304250).

990921542 is a wasteful number, since it uses less digits than its factorization.

990921542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 393023.

The product of its (nonzero) digits is 58320, while the sum is 41.

The square root of 990921542 is about 31478.9063024750. The cubic root of 990921542 is about 996.9646432648.

The spelling of 990921542 in words is "nine hundred ninety million, nine hundred twenty-one thousand, five hundred forty-two".