2151958 has 16 divisors (see below), whose sum is σ = 3392640. Its totient is φ = 1022400.

The previous prime is 2151943. The next prime is 2151971. The reversal of 2151958 is 8591512.

2151958 = T₃₅₇ + T₃₅₈ + ... + T₃₈₇.

It is a Harshad number since it is a multiple of its sum of digits (31).

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, 3498 + ... + 4066.

It is an arithmetic number, because the mean of its divisors is an integer number (212040).

2^2151958 is an apocalyptic number.

2151958 is a deficient number, since it is larger than the sum of its proper divisors (1240682).

2151958 is a wasteful number, since it uses less digits than its factorization.

2151958 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 663.

The product of its digits is 3600, while the sum is 31.

The square root of 2151958 is about 1466.9553503771. The cubic root of 2151958 is about 129.1054563025.

The spelling of 2151958 in words is "two million, one hundred fifty-one thousand, nine hundred fifty-eight".