3951249142 has 4 divisors (see below), whose sum is σ = 5926873716. Its totient is φ = 1975624570.

The previous prime is 3951249121. The next prime is 3951249149. The reversal of 3951249142 is 2419421593.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2419421593 = 907 ⋅2667499.

It is a super-2 number, since 2×3951249142² = 31224739564311472328, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 3951249095 and 3951249104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3951249149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 987812284 + ... + 987812287.

It is an arithmetic number, because the mean of its divisors is an integer number (1481718429).

Almost surely, 2^3951249142 is an apocalyptic number.

3951249142 is a deficient number, since it is larger than the sum of its proper divisors (1975624574).

3951249142 is a wasteful number, since it uses less digits than its factorization.

3951249142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1975624573.

The product of its digits is 77760, while the sum is 40.

The square root of 3951249142 is about 62858.9623045115. The cubic root of 3951249142 is about 1580.9257436069.

The spelling of 3951249142 in words is "three billion, nine hundred fifty-one million, two hundred forty-nine thousand, one hundred forty-two".