1990726157 has 8 divisors (see below), whose sum is σ = 2277777216. Its totient is φ = 1704340512.

The previous prime is 1990726123. The next prime is 1990726181. The reversal of 1990726157 is 7516270991.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1990726157 - 2⁶ = 1990726093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1990726117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 159923 + ... + 171920.

It is an arithmetic number, because the mean of its divisors is an integer number (284722152).

Almost surely, 2^1990726157 is an apocalyptic number.

It is an amenable number.

1990726157 is a deficient number, since it is larger than the sum of its proper divisors (287051059).

1990726157 is an equidigital number, since it uses as much as digits as its factorization.

1990726157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332707.

The product of its (nonzero) digits is 238140, while the sum is 47.

The square root of 1990726157 is about 44617.5543592430. The cubic root of 1990726157 is about 1257.9706471583.

It can be divided in two parts, 19907 and 26157, that added together give a palindrome (46064).

The spelling of 1990726157 in words is "one billion, nine hundred ninety million, seven hundred twenty-six thousand, one hundred fifty-seven".