23401990 has 16 divisors (see below), whose sum is σ = 42200352. Its totient is φ = 9343744.

The previous prime is 23401981. The next prime is 23402009. The reversal of 23401990 is 9910432.

It is a happy number.

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, 4662 + ... + 8278.

It is an arithmetic number, because the mean of its divisors is an integer number (2637522).

Almost surely, 2^23401990 is an apocalyptic number.

23401990 is a deficient number, since it is larger than the sum of its proper divisors (18798362).

23401990 is a wasteful number, since it uses less digits than its factorization.

23401990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4271.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 23401990 is about 4837.5603355410. The cubic root of 23401990 is about 286.0339585087.

The spelling of 23401990 in words is "twenty-three million, four hundred one thousand, nine hundred ninety".