1951990 has 32 divisors (see below), whose sum is σ = 3732480. Its totient is φ = 733824.

The previous prime is 1951967. The next prime is 1951993. The reversal of 1951990 is 991591.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1951993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15307 + ... + 15433.

It is an arithmetic number, because the mean of its divisors is an integer number (116640).

2^1951990 is an apocalyptic number.

1951990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1951990 is a deficient number, since it is larger than the sum of its proper divisors (1780490).

1951990 is a wasteful number, since it uses less digits than its factorization.

1951990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216.

The product of its (nonzero) digits is 3645, while the sum is 34.

The square root of 1951990 is about 1397.1363569817. The cubic root of 1951990 is about 124.9757819749.

The spelling of 1951990 in words is "one million, nine hundred fifty-one thousand, nine hundred ninety".