16401956 has 6 divisors (see below), whose sum is σ = 28703430. Its totient is φ = 8200976.

The previous prime is 16401943. The next prime is 16401977. The reversal of 16401956 is 65910461.

It can be written as a sum of positive squares in only one way, i.e., 16000000 + 401956 = 4000^2 + 634^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2050241 + ... + 2050248.

It is an arithmetic number, because the mean of its divisors is an integer number (4783905).

Almost surely, 2^16401956 is an apocalyptic number.

It is an amenable number.

16401956 is a deficient number, since it is larger than the sum of its proper divisors (12301474).

16401956 is a wasteful number, since it uses less digits than its factorization.

16401956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4100493 (or 4100491 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 16401956 is about 4049.9328389493. The cubic root of 16401956 is about 254.0769188582.

It can be divided in two parts, 16 and 401956, that multiplied together give a square (6431296 = 2536²).

The spelling of 16401956 in words is "sixteen million, four hundred one thousand, nine hundred fifty-six".