81903974 has 16 divisors (see below), whose sum is σ = 125481312. Its totient is φ = 40080768.

The previous prime is 81903973. The next prime is 81904001. The reversal of 81903974 is 47930918.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81903971) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62207 + ... + 63509.

It is an arithmetic number, because the mean of its divisors is an integer number (7842582).

Almost surely, 2^81903974 is an apocalyptic number.

81903974 is a deficient number, since it is larger than the sum of its proper divisors (43577338).

81903974 is a wasteful number, since it uses less digits than its factorization.

81903974 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1951.

The product of its (nonzero) digits is 54432, while the sum is 41.

The square root of 81903974 is about 9050.0814360977. The cubic root of 81903974 is about 434.2784956775.

The spelling of 81903974 in words is "eighty-one million, nine hundred three thousand, nine hundred seventy-four".