3951390 has 16 divisors (see below), whose sum is σ = 9483408. Its totient is φ = 1053696.

The previous prime is 3951379. The next prime is 3951391. The reversal of 3951390 is 931593.

It is a super-2 number, since 2×3951390² = 31226965864200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 131713 = 3951390 / (3 + 9 + 5 + 1 + 3 + 9 + 0).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3951391) 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, 65827 + ... + 65886.

It is an arithmetic number, because the mean of its divisors is an integer number (592713).

Almost surely, 2^3951390 is an apocalyptic number.

3951390 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

3951390 is an abundant number, since it is smaller than the sum of its proper divisors (5532018).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3951390 is a wasteful number, since it uses less digits than its factorization.

3951390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131723.

The product of its (nonzero) digits is 3645, while the sum is 30.

The square root of 3951390 is about 1987.8103531273. The cubic root of 3951390 is about 158.0944529514.

It can be divided in two parts, 3951 and 390, that multiplied together give a triangular number (1540890 = T₁₇₅₅).

The spelling of 3951390 in words is "three million, nine hundred fifty-one thousand, three hundred ninety".