1990457434 has 16 divisors (see below), whose sum is σ = 3413520000. Its totient is φ = 852726384.

The previous prime is 1990457429. The next prime is 1990457471. The reversal of 1990457434 is 4347540991.

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, 12627 + ... + 64345.

It is an arithmetic number, because the mean of its divisors is an integer number (213345000).

Almost surely, 2^1990457434 is an apocalyptic number.

1990457434 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

1990457434 is a deficient number, since it is larger than the sum of its proper divisors (1423062566).

1990457434 is a wasteful number, since it uses less digits than its factorization.

1990457434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54477.

The product of its (nonzero) digits is 544320, while the sum is 46.

The square root of 1990457434 is about 44614.5428531998. The cubic root of 1990457434 is about 1257.9140412046.

The spelling of 1990457434 in words is "one billion, nine hundred ninety million, four hundred fifty-seven thousand, four hundred thirty-four".